RCOMPOSE_NUMBER is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Default Values for Number Composition - Loan Copy" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_RCOMPOSE_NUMBER TYPE RCOMPOSE_NUMBER.
The RCOMPOSE_NUMBER table consists of various fields, each holding specific information or linking keys about Default Values for Number Composition - Loan Copy data available in SAP. These include SOBJEKT (Internal key for object), RANLSTAMNR (Master number part of loan number for finding contracts), XAKT (File Number), RKLAMMER (Classification Number for Finance Projects)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .